Grate the zest from 2 limes, keep half aside for decoration
Recover the juice from 3 limes
Cut the basil leaves finely
Put the sheet of gelatine in water
Put to boil the lime juice, zest from 1 lime, half of the basil, sugar and butter
In a bowl mix the eggs and the maïzena diluted in a bit of water
When the lime juice mixture is boiling pour it slowly over the eggs and maîzena while whisking vigourously
Pour the whole mixture back in the pan and bring to boil. Let it boil for around 3 minutes while whisking vigorously all the time
Squize the water out of the gelatine and mix it into the hot mixture
Add the rest of the basil and let it cool down to room temperature, turning it now and then. Cover up with plastic and let it cool down completely in the fridge